Rotatable transmission irreversible in both directions



June 16, 1931. R, PE1-rr 1,8 1,85

Bouman: TRANsMrssioN IRREVERSIBLE m'o'ra DIRECTIONS Filed April 28, 1928:s sheets-sheet 1 Afr/s. i

R. PETIT June 16, 1931. 1,810,851

I ROTATABLE TRANSMISSION IRREVERSIBLE IN BOTH DIRECTIONS Filed April 28.1928 '3 Sheets-Sheet 2 June 16, 1931. R, PE'm Y 1,810,851

ROTATABLEv TRANSMISSION IRREVERSIBLE -IN BOTH DIRECTIONS FilKed April28. 1928 3 Sheets-5h89?IV 3 Patented June 16, 1931 UNITED @STATES'PATENT-OFFICE f RAYMOND Inrrnorjgranrs, FRANCE, AssIGNoa fro YSOCITANONYME .rnANcaIsn L DITE: BRICAILD, ANOIENNELIVIAISQN.,srnnLIN, orInItIsrRANOE ROTATABLE rRANsIIIssIoN Innnvnnsrnmi IN Born DIRECTIONSApplication filed April 28,1928, Serial No. 273,533, and in' FranceMarch 29, 1928.

hepurpose ofthe present invention is to provide'someuseful improvementsto direct irreversible transmission systems for angular movements suchas speciiied intheU-.YS patent application Ser. No..2i6,597ofJan, 13th,

1928 by Raymond' Petit, said improvements allowing to eifect as desiredthe partialor the total unlocking oflthedevice.y

In the .accompanying drawings: l

VFig. lisa diagrammatical view and along the vaxis of rotationlof anirreversible locking device. l

F'g. A2, is a section along the axis of rotation of thesameirreversiblelocking device comprising a releasing member whichopposes wholly or partially tothe secondary` reactions ofthe controllinglevers of the locking segv ments. v

Fig. 3 is adIagramma-t cal front view Ona reduced scale of the `samedev1ce,the= cam being in aposition where it does not actupon theirreversible system. v v Fig. et 1s a simllar diagrammatical view,

the releasing cam being in another position.y

Fig. .5 is arsection along the axis of rotation of an irreversiblelocking device provided V,with a member .controlling the distance'between -the lowerarrns of the levers. f

Fig. 6 isa section along Aline VITYI of Fig. 5 ofthesame.device'provided with the i samecontrolling member.

Figs. 7 8, and. 9 are elevations 1respectively of hl'devices showninFigsl, 2,4andr5.

The type of apparatuson whichthedevice is to be yemployed is perhapsVbest illustrated in my prior application .previously .referred to,andthe Adetails `oflwhichjare shown in present Figs, l5 and 6.l As isevident there.- from the `fizedfbox 2.3 has interiorly monnted thereinan eccentric or cam-shapedtenon 25.

1 This .tenonengages ina housing -formedbythe two levers 26 andf27, andissuitably shaped vforthis purpose. These ,two levers pivot on a common-free Vtrunnion29 and are separated'a sufficientdistance toenablegthemto ordinarily oscillat'efslightly on the said trnnnion. wall of the saidbox,V andat their faces .opposed to that onwhich thesaid free .trunnion29 bears, the .levers .2,6 iand27 pivot respecs sectionV At theirendsfnearest the innerV tively lon freetrunnions .30 and 31, on which ilatter also rest thefree segments 32 and 33,'

.the outercylindrical curvature vof which is In the; hollow centralspacepresentbet-ween the segments 32 and 33avndthe levers 26and27fis.located the sector 35jhaving a Vslot of which the sides 36vand `37enclose'the levers 26 Aand `27 but permit a slight" separation thereof;the sector 35 is iXedtoaj shaft 36 V l. which'can turn freely inthe-boX'23 and which ber 39.1" 'Y 1 Y Itfwillk be noticed that thedifferent pieces which constitute thelocking gear (levers ,26 and'27',trunnions 2,9, 30, 3l and 34, and segments32-and 33) lare independentboth of the is directly connectedwith'the driven lmemmember21andthemember `39 and that the actionv of the saidmembers on thelocking gear'can be efectedlonlyby the tenon 25 (for themember vandvbythe `planes 3 6 andv 37 (for the memb'e rs21.-39), these acting re'-spectively .for separatingand drawing together the free lends of thevlevers v26 Vand .27, irrespective of the direction of rotation.

i When an angularniovement is imparted to the .driving member 2'1in onedirection or the other, thetenon 25, acting on one or the other of thelevers 26 and 27 and lying between these'levers, separates thelowerarms, which action, by Oscillation ofthearms on the trunnion 29,causes the upper .arms to be drawn together and causes the separation'ofthe segments from lthe innerwalls ofthe box 23; :thelockinggear can thenv.turn freely in the box and carry withy it thedriv'en :member 39 bytheaction of one ofthe levers26 and 27 on one of the sides 36 or 37 oftheslot of the' sector 3.5. i

directionor the` other,one 0f the sides 36 or 57 bears outwardly Qnthelevercorrespondng Onthe other hand, ifa conple is applied -to -themember39 to effectatsrotation yin one thereto and causes the deformation ofthe triangle 29, 30, 31 and the separation of the two trunnions 30 and81 which tightly press the segments 82 and 33 against the inner wall ofthe box 23, thereby preventing any rotation ofthe locking gear and inconsequence of the members2l and 39 integral in lrotation with such gearthrough the sector 35.

. The apparatus describedimmediately above relates entirely totheVVirreversible type of" transmission. The obj ect of the invention is totemporarily destroy the said irreversibility either in its entirety orpartially,'so that when the operator desires, the secondary member candrive the primary'member.

' As shown in Fig. Vl, which is a-section along the aXis of rotation, anirreversible de# i vice, similar toV device of the copending applicationmentioned above, is applied between L, a primary member 2l and asecondary memberlf39the rotation ofthe primary 21 being transmitted Atothe secondary member by means oi'said device. The irreversibility of thesystem can be suspended by bringing the primary/and the secondaryymembers into working engagementbyany suitable means as ror-examplea pin5x6-sliding in the secondary member 39 and adapted to engage withinahole .57 ot'same diameter bored'iin the prie mary, saidengagement-beingcaused by any suitable exterior controlling means (lever, liexible'wire,etc.). Y v f Said Apin can-otr course just ried bythe primary member tobe'engaged with the secondary member when desired and itis Jclearthatwithout impairing theffeatures of my invention thepinshown in thedrawings can be .replaced by` any other lorgan adapted to engage theprimarymemberAv with the secondary member as desired. Y,

'Forthispurpose.oneor'several pawls, keys, etc. maybe resorted'to andtheiprimary men vber`mayfengage with the lsecondary member quiteindiferently whether bythe movement et a movable controlling linkor'fbyf the relaf tive Adisplacement of the primary member and thesecondarymembersoy as vto engage the movable member with a connectingpart liXed upon fthe member which does not move.

VAs above stated, it maysonietimes be neces.- sary toxetfect 'at anytimethe reversibility of such an arrangementby means oit a decouplingarrangement. Figure l shows a de'- sign realizingthispurpose` AThereversibility of the system can be eliminated'through the stabilizedprimary member21`, and the sec-A ondarycmember 39 through a' memberbeing moved inthe secondary 39. If necessary, this member canv engage ina hole '57, 'which is vmadein the primary memberl" DiiferentV designsare shown in Figures 2 to 4. The stabilization may bedone'eitherpartially or conipletely,and the secondary member, 'betweenwhich the 'arrangement of the reversible transmission is interposed,byvmeansof a as well; be carcam or other Vmovable lifter on the outsidebeing operable to join rigidly the primary member and the secondarymember. In these designs, the decoupling organ or the revers- Y iblearrangement is composed of a lifter 58,

- capable of revolving with the stabilized axis of the'primary member2l. This lifter is insertedbetween the two branches ot astabilizedforlr() of the driven shaftY 39.V

Finally, in the lastdesign Figs. 5 and 6, the tenon 25 of themechanism'ot thereversible transmission hasa convenient section, forexample, an elliptic section. On

Vthe whole, the decoupling'mechanism applied transmission byinsertingbetwe'en theusolid branches'of the seconda-ry member Va camofconvenient section, capable to revolve under the action yof fadrivingfgear with a lsolid,

axis orthe'primary-member. Bypref venting entirelyy orV partially theapproach of the'i'iiiterior branches of they reverse of the blockingsegments to the reversible transmission arrangement by meansofr'hgivingthe tenon 25 otthis reversible transmission. arrangement theshape of'a cam Capable of revolving under-the afction of a driving gearbetween both of the already mentioned levers. rPhe Figs. 2, 3 and4 referto an embodiment' of my invention in which the vengagement of thesecondary member and the-.pri-

mary member may be complete or ,partial ,the

action ofthe unclutchiiig member causesfin this case, accordingtotheposition oiflsaid membe'nthe completefor'a partialsuspension ofthereactions of the secondary member upon the" controllingllevers of thelocking Ysegments. c f As shown in F igs."2, f3 and 4 the unclutchingmember of ,thejirreversible jdevice' con# sists offa cam 58,fofaisuitableshape, adapted to rotate on''api'vot 459, ,fixed upon Vtheprimary member' 21';jthis camy 58is engaged 9' between the two armsof a.orlr GOtiXedupon the"secondary'niernlpmpr(39..y t er -v *.'fWhen thecam58 isin 'the' position shown inl Figgi, in whichlposition` itslvfvorking falce is; at some distanceffrom the .two armsofthe A" fork,60, the irreversibledevice Y may Vwork normally because nothingopposesto" the action 'of Vthe y segment 35- upon the lower arms.

vOn the` 'other hand whenfthe cam in the position" shown in Fig. 4 whereits work;

lll() fl lil ing face is jammed between the two arms of the fork 60, theprimary member 21 is rigidly connected with the secondary 39 and theirreversible device cannot work, for any action of segment 35 upon thelevers 26 and 27 is prevented.

Between these two positions the cam 58 can be brought to any desiredposition so that the clearance, between the secondary member and theprimary member gives the action of segment 35 upon the levers 26 and 27the required amplitude to cause, not the locking of segments 32 and 33against the interior walls of the box 23, but amore or less eectivepressure against these walls, so as tocause a partial irreversibility ofthe transmission gear, by braking more or less energetically thereaction of the secondary member.

It can be seen that by these means it is possible to control, bylimiting the amplitude allowed to the levers 26 and 27, the intensity ofthe locking effect for the normal operation of the irreversible device.

It is well understood that in this case, as in the former, the rotationof the cam may be caused by any suitable device controlled from theoutside.

The Figs. 5 and 6 refer to an embodiment of the invention in which thetenon of the primary member (this tenon acting between the levers 26 and27 causing thereby the rotation of the secondary member) is not given acircular cross section but any other suitable alter the distance betweenthe lower arms ofv the levers and to cause thereby either theunclutching of the irreversible device or to control lthe brakingeffector the segments upon Y the fixed box 23.

As in the vformer embodiment the tenon may be rotated from the outsideby any suitable device.

devicesvin which the locking eil'ectl is obtained by applying a springagainst the walls of a fixed box. The control of the importance of lwhile the primary member is adapted to act' onthe inside thereof, and amember operated from the outside and Vadapted to rigidly rconnect theprimary andsecondary members.

2; An unlocking mechanism for application to an irreversible gearcomprising a pri- 'mary member, a plurality of locking segments, aplurality of two-armed levers adapted to act upon-a respective lockingsegment,

a secondary member, vthe said primary and secondary members actingrespectively upon' the interior and exterior of the arms of theY saidlevers, means for rigidly coupling to--v gether the primary andsecondary members at will so as 'to prevent the operation of the lockingdevice, the said means comprising a pronged fork connected to one of thesaid members, and a cam carried' by the other member and disposedbetween thel prongs of the said fork, the said cam being rotatable fromthe exterior about its own axis.

In testimony whereof I have signed my name to this specification.V

RAYMOND PETIT.

It is well understood that the embodiments just described and shown inaccompanying drawing have been given only by way of example or thepurpose of showing how my invention can be applied and that any othermembers adapted to cause, by an action from the outside, the partial orthe complete un-V clutching of the irreversible device, either byengaging the primary member with the secondary member or by anycontrolling action Y Y plies, not only to irreversible rotating gearscomprising rigid segments but that it applies also to any other deviceswhich secure the same result and more particularly to such Y las' ice

